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From Morus Walter <>
Subject Re: Disk space used by optimize
Date Mon, 07 Feb 2005 07:39:25 GMT
Bernhard Messer writes:
> >However, three times the space sounds a bit too much, or I make a
> >mistake in the book. :)
> >  
> >
> there already was  a discussion about disk usage during index optimize. 
> Please have a look to the developers list at: 

> <>
> where i made some measurements about the disk usage within lucene.
> At that time i proposed a patch which was reducing disk total used disk 
> size from 3 times to a little more than 2 times of the final index size. 
> Together with Christoph we implemented some improvements to the 
> optimization patch and finally commit the changes.
Hmm. In the case that the index is used (open reader), I doubt your patch 
makes a difference. In that case the disk space used by the non optimized 
index will still be used even if the files are deleted (on unix/linux).
What happens, if disk space run's out during creation of the compound index?
Will the non compound files be a usable index?
Otherwise you risk to loose the index.


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